Here is a still frame from a student film I was in called A Friendly Adversary. You can see the lighting effect that resulted from hanging some blinds between the light and me. Click the picture to see all of it.
I uploaded the image as an example of using lights for a night time feel in response to This Thread at indymogul. The basic setup involved only two lights. The key light was in the next room, shining through some blinds that had been attached to a metal stand, and it had a greenish filter on it. The fill light came from a light pointing into the corner, and pointing away from me with a red gel. Because it wasn’t shining directly on me, the red illumination was extremely soft and diffuse, aiding with the nigh-time “unlit” look.